One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6)(7,9)(8,11)(10,12)(13,14,17,18)(15,16,19,20)(21,22,24,27)(23,26,28,25)(1,2,3,4)(6,7)(8,12)(14,18)(16,20)(21,22)(23,25)(24,27)(26,28)(2,4)(8,12)(10,11)(14,18)(16,20)(21,23,24,28)(22,25,27,26)(2,4)(5,7,9,6)(8,10,12,11)(13,15)(14,16)(17,19)(18,20)(21,22)(23,25)(24,27)(26,28)(1,2)(3,4)(5,8,9,12)(6,10,7,11)(13,16)(14,19)(15,18)(17,20)(21,23)(22,26)(24,28)(25,27)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.